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My personal view is that it's easier to ask forgiveness than permission. Most people working there won't give a rat's * about you using a powerpoint, save perhaps for security, but at most they'll just tell you to move along.
I do a lot of travel, airports, bus stations, train stations, and my eye is always looking subconciously for power sockets now ;) ...

I've used the power in a lot of airports, including YYZ, and never been told not to or even glared at. A few tips:
They have to vaccuum the place. Look for power and you'll see it
In the gate area the plugs are often in the floor. You might have to pry up a cover. Again, no-one seems to mind. When they're not in the floor, they're in the concrete columns
...

I would say you should be fine as long as you're not in the way. Plug in at the boarding area rather than a walkway, and I don't think anyone will bug you. I haven't used the outlets at YYZ, but I've been there a few times and generally security doesn't bother anyone who's not harming anything.

Back from the aforementioned trip, I could enter Canada without hassles.
In Toronto Pearson airport, there is a left luggage facility located on departures level, at the far right end when looking toward the gates, close to the A section of check-in counters. It is operated by a small luggage and souvenirs shop and it costs $5 (Canadian) to store a small ...

Been there, done that, and yes, it's definitely worth getting out for the airport for the day. You'll be granted a visa on arrival and entering "TRANSIT" for reason of stay/place of stay is perfectly acceptable (show your onward ticket in the unlikely event that they ask).
If I'm reading this right, you should be able to check your bags through directly ...

You have a number of choices:
Take the TTC. For example, subway to Kipling (west end of line 2, transfer from line 1 at St George), then "rocket" bus line 192 to the airport. It will cost you $3.00. You may not enjoy dealing with your luggage and you may have to change a bit, eg streetcar to subway, change subway at Yonge/Bloor, then subway to bus.
Take ...

I found a picture of the cart dispensers. It says all rights reserved so I'll just link to it. It clearly shows that they take
coins
credit cards
bills
I don't see any indication of change-giving although it's possible that is below the frame of the picture. Next to the coins slot someone has taped up a diagram of what coins are ok and they appear to be ...

The airport web site suggests you may be some other sort of priority traveler:
A priority lane will be available for Nexus cardholders and airline guests with priority designations.
NEXUS cardholders and airline guests with priority access may enter the U.S. Customs hall directly at any time by showing their boarding pass and/or valid Nexus card and ...

Technically, yes, they want the baggie of freedom. They have a supply of them right before security, so you could transfer your liquids into one at the airport.
In practice, my liquids usually go through in a washing bag with one clear side that stays in my bag. This has never caused me any problems and I have not been asked to move my liquids into a ...

Is it possible your connecting flight's boarding time was near? I've been sent to priority customs/passport/security lines when I had a tight connection - both airlines and airports have strong motivations to ensure everyone boards on time because missing passengers can cause very costly delays.

You need a Canadian visa (unless you have a US visa and you travel to/from the USA). I assume you are a resident of Philippines. Here are relevant references:
From Timatic:
National Philippines (PH) /Transit Canada (CA) Destination St.
Vincent and the Grenadines (VC) ALSO CHECK DESTINATION INFORMATION
BELOW
Canada (CA)
TWOV (Transit ...

You will be passing the US immigration in Toronto, before boarding. That will be your "port of entry", and they'll have to be the ones to approve your TN status. Plan your time accordingly.
This is a question for the "Immigration" site on SE - please join in commitment here.

There is no Terminal 2. Terminals are assigned by airline, not by destination. There are divisions within each terminal for destination, but you start at the desk for your airline. Transat uses Terminal 3.
You can get this information for any airline from the YYZ web site.
If you are being driven to the airport by a paid professional (taxi, shuttle bus ...

They did not mention a specific named type, but they provided the exact sizes for the allowed 1-litre plastic bags along with the required features, from catsa.gc.ca (linked in the official Pearson website):
Containers of liquids, food and personal items in your carry-on must be 100 ml/100 grams (3.4 oz) or less. All containers must fit in one clear, ...

Your best source of information on this is the airline, who wouldn't sell you the ticket if they thought you couldn't make the connection. But some extra information to reassure you:
you do not have to change terminals
you may not have to go through customs at all - for some flights you can stay airside and go through a much simpler process
you may or may ...

I can only offer the page from the manufacturer of the cart management system
Accept credit cards (PCI-DSS Compliant)
Accept cash
Give change
Display multilingual instructions
Offer the option to provide a reward to customers when they return carts
Unfortunately I could not find anyone taking a picture of the CMU at Pearson to verify the ...

Pearson has a very cool Connecting Guide that answers this question for you. I entered your details, and it said (bolding mine):
Arrive at Toronto Pearson. Your flight will be arriving at Terminal 1.
Confirm your gate number. Once you're in the terminal, look for your departing flight on the flight information screens then follow the "A" connection ...

Yes, your assumption is correct. Depending on the time of your flight usually the customs usually is fast. However, you have to keep in mind the Christmas rush and be swift at the airport. You also have to keep in mind that you will go through preclearance when boarding a US bound flight. If you/r bags aren't pulled over for extra scrutiny you will be fine, ...

Last couple of times I didn't have to, but some others (including a woman they were paying special attention to) did. It may depend on destination- these were not US destinations (Mexico and Canada), so relatively low risk compared to the US or UK.